mirror of
https://github.com/dborth/fceugx.git
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85 lines
2.0 KiB
C++
85 lines
2.0 KiB
C++
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2012 CaH4e3
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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static uint8 bank, mode;
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static SFORMAT StateRegs[] =
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{
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{ &bank, 1, "BANK" },
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{ &mode, 1, "MODE" },
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{ 0 }
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};
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static void Sync(void) {
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if (mode & 2) {
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setprg8(0x6000, ((bank & 7) << 2) | 0x23);
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setprg16(0x8000, (bank << 1) | 0);
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setprg16(0xC000, (bank << 1) | 1);
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} else {
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setprg8(0x6000, ((bank & 4) << 2) | 0x2F);
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setprg16(0x8000, (bank << 1) | (mode >> 4));
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setprg16(0xC000, ((bank & 0xC) << 1) | 7);
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}
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if (mode == 0x12)
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setmirror(MI_H);
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else
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setmirror(MI_V);
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setchr8(0);
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}
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static DECLFW(M51WriteMode) {
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mode = V & 0x12;
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Sync();
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}
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static DECLFW(M51WriteBank) {
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bank = V & 0x0F;
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if (A & 0x4000)
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mode = (mode & 2) | (V & 0x10);
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Sync();
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}
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static void M51Power(void) {
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bank = 0;
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mode = 2;
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Sync();
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SetWriteHandler(0x6000, 0x7FFF, M51WriteMode);
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SetWriteHandler(0x8000, 0xFFFF, M51WriteBank);
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SetReadHandler(0x6000, 0xFFFF, CartBR);
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}
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static void M51Reset(void) {
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bank = 0;
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mode = 2;
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Sync();
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}
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static void StateRestore(int version) {
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Sync();
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}
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void Mapper51_Init(CartInfo *info) {
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info->Power = M51Power;
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info->Reset = M51Reset;
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AddExState(&StateRegs, ~0, 0, 0);
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GameStateRestore = StateRestore;
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}
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